var banner = new Array();

banner[0]='https://i.servimg.com/u/f23/15/73/94/42/hpum_c10.jpg';
banner[1]='https://i.servimg.com/u/f23/12/53/44/43/bannhp10.jpg';
banner[2]='https://i.servimg.com/u/f23/12/53/44/43/bannhp12.jpg';

document.getElementById('i_logo').src= banner[Math.floor(Math.random()*banner.length)];